Rotary body fixing device

Abstract

A rotary body fixing device capable of mounting and removing a rotary body on a shaft easily and rapidly. The device has inner and outer elastically deformable rings and a pair of oppositely tapered rings for wedging between the inner and outer rings in a clamping position. Extraction bolt holes 4F for threaded engagement with extraction bolts 7 are formed axially through one tapered ring 4. The extraction bolts 7 come into abutment at their tip ends against an end face of the other tapered ring 5 to move both tapered rings away from each other. In an axially medial part of the outer peripheral surface of the inner ring 2 and of the inner peripheral surface of the outer ring 3, annular grooves respectively form stepped portions on both sides of the annular groove. At or adjacent the opposite ends of the paired tapered rings, retaining flange portions engage the stepped portions when the rings are displaced outwardly a predetermined distance from the clamping position so that outward displacement of the retaining flange portions is limited by the stepped portions. Registering annular cylindrical flats are provided between the flanges and the tapered surfaces of the tapered rings, and between the grooves and the tapered surfaces of the inner and outer rings.

I claim: 
     
       1. In a fixing device for a rotary body, said device having a rotary axis and a medial part between the axial ends of said device including: an elastically deformable inner ring having an inner peripheral surface along which a shaft is to be inserted and an outer peripheral surface formed by a pair of tapered surfaces which are larger in diameter toward the medial part;   an elastically deformable outer ring having an outer peripheral surface to be fitted in a boss hole of the rotary body and an inner peripheral surface formed by a pair of tapered surfaces which are smaller in diameter toward the medial part;   said inner and outer rings being concentric and providing an annular clearance therebetween;   a pair of tapered rings wedged axially from both sides into said annular clearance, said paired tapered rings each having an inner peripheral surface formed by a tapered surface conforming to the outer peripheral surface of said inner ring and an outer peripheral surface formed by a tapered surface conforming to the inner peripheral surface of said outer ring; and   clamping means for pulling said paired tapered rings axially toward each other to a clamping position; the improvement wherein   said outer elastically deformable ring has an annular groove formed adjacent the medial part in the inner peripheral surface of said outer ring, said groove being larger in diameter than the smallest diameter of said of tapered surfaces of the outer ring, at least one land area axially outward from said annular groove between said groove and at least one of said tapered surfaces of the outer ring, said land area having a cylindrical diameter corresponding to the smallest diameter of said tapered surfaces of the outer ring, said cylindrical land area forming a transverse step facing the medial part of the device between the groove and said at least one tapered surface of the outer ring,   at least one of said paired tapered rings having a transverse end face confronting the medial part of the device, and a retaining flange portion for engagement beyond said transverse step within said annular groove,   said at least one retaining flange portion having a cylindrical surface extending from said transverse end face toward the tapered surface, said tapered ring having a cylindrical land area between said flange portion and the tapered surface, said cylindrical flange surface and land area being different in diameter so as to provide a radial abutment surface on said at least one tapered ring adapted to engage behind said step,   the cylindrical flange surface of said at least one tapered ring being of lesser axial length than the axial length of said annular groove to enable said flange to seat within said annular groove, and   the axial length of the land area of said outer elastically deformable ring being not greater than the axial length of said land area of the at least one tapered ring to enable said respective land areas to mate.   
     
     
       2. A fixing device according to claim 1 wherein said step and said abutment surface comprise flat radial surfaces forming ninety degree angles with said cylindrical surfaces. 
     
     
       3. A fixing device according to claim 1 wherein the axial length of said land area of the deformable ring is smaller than the axial length of the land area of the tapered ring, providing a clearance between the abutment surfaces and the steps when said tapered surfaces of the deformable ring and the tapered ring mate. 
     
     
       4. A fixing device according to claim 1 wherein there are two land areas in the inner peripheral surface of said outer ring, said land areas being beyond the opposite axial ends of said groove and forming transverse steps, each of said paired tapered rings having a transverse end face and a retaining flange portion to seat within said annular groove beyond one of said transverse steps. 
     
     
       5. In a fixing device for a rotary body, said device having a rotary axis and a medial part between the axial ends of said device including: an elastically deformable inner ring having an inner peripheral surface along which a shaft is to be inserted and an outer peripheral surface formed by a pair of tapered surfaces which are larger in diameter toward the medial part;   an elastically deformable outer ring having an outer peripheral surface to be fitted in a boss hole of the rotary body and an inner peripheral surface formed by a pair of tapered surfaces which are smaller in diameter toward the medial part;   said inner and outer rings being concentric and providing an annular clearance therebetween;   a pair of tapered rings wedged axially from both sides into said annular clearance, said paired tapered rings each having an inner peripheral surface formed by a tapered surface conforming to the outer peripheral surface of said inner ring and an outer peripheral surface formed by a tapered surface conforming to the inner peripheral surface of said outer ring; and   clamping means for pulling said paired tapered rings axially toward each other to a clamping position; the improvement wherein   said inner elastically deformable ring has an annular groove formed adjacent the medial part in the outer peripheral surface of said inner ring, said groove being smaller in diameter than the largest diameter of said tapered surfaces of the inner ring, at least one land area axially outward from said annular groove between said groove and at least one of said tapered surfaces of the inner ring, said land area having a cylindrical diameter corresponding to the largest diameter of said tapered surfaces of the inner ring, said cylindrical land area forming a transverse step facing the medial part of the device between the groove and said at least one tapered surface of the inner ring,   at least one of said paired tapered rings having a transverse end face confronting the medial part of the device, and a retaining flange portion for engagement beyond said transverse step within said annular groove,   said at least one retaining flange portion having a cylindrical surface extending from said transverse end face toward the tapered surface, said tapered ring having a cylindrical land area between said flange portion and the tapered surface, said cylindrical flange surface and land area being different in diameter so as to provide a radial abutment surface on said at least one tapered ring adapted to engage behind said step,   the cylindrical flange surface of said at least one tapered ring being of lesser axial length than the axial length of said annular groove to enable said flange to seat within said annular groove, and   the axial length of the land area of said inner elastically deformable ring being not greater than the axial length of said land area of the at least one tapered ring to enable said respective land areas to mate.   
     
     
       6. A fixing device according to claim 5 wherein said step and said abutment surface comprise flat radial surfaces forming ninety degree angles with said cylindrical surfaces. 
     
     
       7. A fixing device according to claim 5 wherein the axial length of said land area of the deformable ring is smaller than the axial length of the land areas of the tapered ring, providing a clearance between the abutment surfaces and the steps when said tapered surfaces of the deformable ring and the tapered ring mate. 
     
     
       8. A fixing device according to claim 5 wherein there are two land areas in the outer peripheral surface of said inner ring, said land areas being beyond the opposite axial ends of said groove and forming transverse steps, each of said paired tapered rings having a transverse end face and a retaining flange portion to seat within said annular groove beyond one of said transverse steps. 
     
     
       9. In a fixing device for a rotary body, said device having a rotary axis and a medial part between the axial ends of said device including: an elastically deformable inner ring having an inner peripheral surface along which a shaft is to be inserted and an outer peripheral surface formed by a pair of tapered surfaces which are larger in diameter toward the medial part;   an elastically deformable outer ring having an outer peripheral surface to be fitted in a boss hole of the rotary body and an inner peripheral surface formed by a pair of tapered surfaces which are smaller in diameter toward the medial part;   said inner and outer rings being concentric and providing an annular clearance therebetween;   a pair of tapered rings wedged axially from both sides into said annular clearance, said paired tapered rings each having an inner peripheral surface formed by a tapered surface conforming to the outer peripheral surface of said inner ring and an outer peripheral surface formed by a tapered surface conforming to the inner peripheral surface of said outer ring; and   clamping means for pulling said paired tapered rings axially toward each other to a clamping position; the improvement wherein   said inner elastically deformable ring has an annular groove formed adjacent the medial part in the outer peripheral surface of said inner ring, said groove being smaller in diameter than the largest diameter of said of tapered surfaces of the inner ring, at least one land area axially outward from said annular groove between said groove and at least one of said tapered surfaces of the inner ring, said land area having a cylindrical diameter corresponding to the largest diameter of said tapered surfaces of the inner ring, said cylindrical land area forming a transverse step facing the medial part of the device between the groove and said at least one tapered surface of the inner ring,   said outer elastically deformable ring has an annular groove formed adjacent the medial part in the inner peripheral surface of said outer ring, said groove being larger in diameter than the smallest diameter of said tapered surfaces of the outer ring, at least one land area axially outward from said annular groove between said groove and at least one of said tapered surfaces of the outer ring, said land area having a cylindrical diameter corresponding to the smallest diameter of said tapered surfaces of the outer ring, said cylindrical land area forming a transverse step facing the medial part of the device between the groove and said at least one tapered surface of the outer ring,   at least one of said paired tapered rings having a transverse end face confronting the medial part of the device, and retaining flange portions for engagement beyond said transverse steps of said inner and outer rings within said annular grooves,   each of said retaining flange portions having a cylindrical surface extending from said transverse end face toward the tapered surface, said tapered ring having a cylindrical land area between each flange portion and the adjacent tapered surface, said cylindrical flange surface and land area being different in diameter so as to provide radial abutment surfaces on the tapered rings adapted to engage behind said steps,   the cylindrical flange surfaces of said at least one tapered ring being of lesser axial length than the axial length of said annular grooves to enable said flanges of said tapered ring to seat within said annular grooves,   the axial length of each of the land areas of said inner and outer elastically deformable rings being not greater than the axial length of said land areas of the tapered rings to enable said land areas to mate.   
     
     
       10. A fixing device according to claim 9 wherein said steps and said abutment surfaces comprise flat radial surfaces forming ninety degree angles with said cylindrical surfaces. 
     
     
       11. A fixing device according to claim 9 wherein the axial length of the land areas of the deformable rings are smaller than the axial length of the land areas of the tapered ring, providing a clearance between the abutment surfaces and the steps when said tapered surfaces of the deformable rings and the tapered ring mate. 
     
     
       12. A fixing device according to claim 9 wherein there are two land areas in the outer peripheral surface of said inner ring and two land areas in the inner peripheral surface of said outer ring, said land areas being beyond the opposite axial ends of the groove in the associated rings and forming transverse steps, each of said paired tapered rings having a transverse end face and two retaining flange portions to seat within said annular grooves beyond said transverse steps.